ceph: add get_name() NFS export callback
Use the newly introduced LOOKUPNAME MDS request to connect child
inode to its parent directory.
Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 8bf2384..91d6c9d 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1044,10 +1044,59 @@
session, req->r_request_started, -1,
&req->r_caps_reservation);
if (err < 0)
- return err;
+ goto done;
} else {
WARN_ON_ONCE(1);
}
+
+ if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
+ struct qstr dname;
+ struct dentry *dn, *parent;
+
+ BUG_ON(!rinfo->head->is_target);
+ BUG_ON(req->r_dentry);
+
+ parent = d_find_any_alias(dir);
+ BUG_ON(!parent);
+
+ dname.name = rinfo->dname;
+ dname.len = rinfo->dname_len;
+ dname.hash = full_name_hash(dname.name, dname.len);
+ vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
+ vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
+retry_lookup:
+ dn = d_lookup(parent, &dname);
+ dout("d_lookup on parent=%p name=%.*s got %p\n",
+ parent, dname.len, dname.name, dn);
+
+ if (!dn) {
+ dn = d_alloc(parent, &dname);
+ dout("d_alloc %p '%.*s' = %p\n", parent,
+ dname.len, dname.name, dn);
+ if (dn == NULL) {
+ dput(parent);
+ err = -ENOMEM;
+ goto done;
+ }
+ err = ceph_init_dentry(dn);
+ if (err < 0) {
+ dput(dn);
+ dput(parent);
+ goto done;
+ }
+ } else if (dn->d_inode &&
+ (ceph_ino(dn->d_inode) != vino.ino ||
+ ceph_snap(dn->d_inode) != vino.snap)) {
+ dout(" dn %p points to wrong inode %p\n",
+ dn, dn->d_inode);
+ d_delete(dn);
+ dput(dn);
+ goto retry_lookup;
+ }
+
+ req->r_dentry = dn;
+ dput(parent);
+ }
}
if (rinfo->head->is_target) {